(See major companies that do.) However, Apple does hire for work-at-home positions in at least one division, its AppleCare support team. Most of its home-based customer service jobs, called Apple At-Home Advisors, are virtual call center positions; however there are also separate chat agent positions.
Stress fractures heal with time and rest. Athletes are advised to rest from any activity that caused the stress fracture for the 6-14 weeks that the fractures take to heal (ask your doctor how long your particular fracture will probably take to heal), or until pain-free for 2-3 weeks.
Some physicians may say that recovery from head injury is 6 to 9 months. This may stem from a medical point of view, as they commonly look at how long it takes to relearn to walk or use parts of the body. As a neuropsychologist, I look at complex thinking and very subtle changes in behavior.